just wondering if anyone in Aus is capable of doing a firefighting endorsement in a R44 (or 22) as I cant really afford to do it all in a turbine off my own back. Also any general comment about getting into firefighting in general for a 1500 hour pilot.

I believe not a single state in Aus allows piston engined helicopters on fires, and as a result I highly doubt that anyone has a bucket small enough to suit the 44... Though a JetRanger size bucket could be cinched in to 70% to potentially fit the 44 lifting capability.

As far as I'm aware the MOS for the firefighting endorsement does not tell you if a turbine or piston helicopter has to be used, so it might be possible if you can find an operator...